Casimir roger jouve



(No Model.)

C. R. JGUVE.

GALGULATING RULER- y No. 571,567. Patented Nov. 17,'1896.

l l i @Hrm-m Loo 400.

dono

i0 000. Loon.

Warnier @irren CASIMIR ROGER JOUVE, OF DAX, FRANCE.

CALC U LAT ING-RULER.

SPECIFICATION forming part of Letters Patent No. 571,567, dated November 1*?, 1896.

Application filed February 19, 1896. Serial No. 579,925. (No model.)

To @ZZ whom it may concern,.-

Be it known that I, CASIMIR ROGER J oUvE, a citizen of the French Republic, residing at Dax, in the Department of Landes, France, have invented certain new and useful lmprovements in Calculating-Rulers, of which the following is a specication.

The object of the present invention is a simple apparatus adapted to explain clearly to children in a school the enumeration and the decomposition of numbers up to ten thousand; to give them the iirst notion of addition and subtraction, multiplication and division; to make them familiar to count by memory, die.

This apparatus is shown in the accompanying,` drawings, in Figure l, in side elevation. Fig. 2 is a plan view, and Fig. 3 a cross-section.

It consists in a ruler of trapezoidal section a, havin g any desired dimension for instance, a length of one hundred and twenty centim eters, a Width at the base of six centimeters, a Width at top of three centimeters, and a height ot' three centimeters.

The ruler is divided in four equal parts from right to left in the sense of Writing,` numerals. These parts are provided on the top of the ruler with four series of ten holes each, the lirst series being that of the units, the second that of the tens, the third that of the hundreds, and the fourth that of the thousands. These holes have for each series from right to left a diameter which increases, for instance, being sin millimeters for the units, eight millimeters for the tens, ten millimeters for the hundreds, and twelve millimeters for the thousands, the depth of the holes being uniform of twenty iive millimeters each. Under each hole on the part'of the units from right to left the numerals l 2 3 a 531 *U3 (733 C6877 (937 (61077 are Ol, engraved. These numerals represent the units. Forbetterdistinction the wor( units may be also printed in big letters on the side of the ruler in the middle of the part of units.

The series of holes of the tens, hundreds, and thousands are numbered and indicated in a similar manner, t'. e., l0,7 20, 30, to 100 on the part of the tens, 100, 200, 300, to 1,000 on the part of the hundreds, and 1,000, 2,000, 3,000, dce., to

10,000J on the part of the thousands. Under these numerals, near the base of the ruler, the numbers l to l0 are engraved on each part, but the numerals increase correspondingly in dimensions, as clearly shown in Figs. l and 2. All these designations are on one of the inclined surfaces of the block. The other surface is divided equally in centimeters, so that the ruler can always form an exact centric measure. Each hole is provided With a stick varying' in thickness, length, and also in color according to the four series of holes. These sticks fit in the holes with slight friction. The thinnest and shortest sticks D indicate the units, the next size o the tens. The sticks d represent the hundreds and the sticks e the thousands.

By taking,` out the sticks or by displacing them the reading of numbers can be practiced. 1 For instance, if the teacher sets astick e in the hole 2, a stick (l in hole l, a stick c will read 2,132

The iirst notion of multiplication maybe given by placing' sticks in the holes in any of the four sections from l to a certain number, say, from l to 4,in section of sticks d. The children will read immediately four times 100 is 5200, cc. lt will be easily understood by teachers Without any further explanation here to practice division and subtraction in a similar manner.

The apparatus can be placed before the class in two manners. First, it may be suspended from two hooks in the middle of the blackboard parallel to the base of the same, or, secondly, it may be placed horizontally on the table, resting on its Wider base.

lt is obvious that the length of the ruler can be increased, and the sections may be continued to millions or any higher numbers.

Having thus described my invention, l claim as new and desire to secure by Let-ters Patentl. A ruler divided into sections, each provided With ten holes of equal diameter for each section, but increasing` in diameter from section to section, being smallest in the section to the right and largest in the section to the left, said holes being adapted to receive with slight friction, sticks of diilerent diameter to iit said holes, and having a diiferent in hole 8, and a stick b in hole t-he children IOO length, the sticks in the section to the right, representing the units,beintl1e shortest and thinnest but equal to each other and the sticks in the section to the left representing the thousands, being the thickest and the longest, also equal to .each other.

2. A ruler divided into section-s, each pro-4 vided with ten holes adapted to receive with slight friction, sticks of different length, different diameter and different color, being equal in eicl'i seetion, said ruler having` nu merels' engrsiv'ed in front of the holes, from l ito l0 in 'the section of the liinits, from 107 to 100 in the seetion'of the tens,

from 1007 to 1,0007 in the section ofk the hundreds, die., and having in the section of the tens the numerals l to 10 marked or engraved at the base of the'rnler in premi nent size, and in thel next section hin-ving the numerals l to l0 engraved under the numerals from 100 to 1,0007 in still more prominent size, drei, substantially as described and for the purpose set forth.

In testimony whereof I have signed niy name to this specification in the presence of Vtwo subscribing Witnesses.

CASIMIR ROGER XVitnesses:

Lonrs S. Fnnissn, EMIL PULXYET.

JOUVE. 

